SCIENTIFIC ABSTRACT VAIVADS, A. - VAJDA, GY.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001858410002-2
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: August 31, 2001
• Sequence Number: 2
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

MYAGKOVA, A.; KARLSONS, K.; VAIVADS I- A.
Changes of some pbysical and physieochomical properties of mortar
samples from unslak6d -dolomite lime during hardisning. Part 2: Changes
of Jekabpils dolomite lime properties depending on dolomite ealcina-
tion temperature and storage conditions of samples. Vestis Latv ak
no.12:77-82 '61.
1. Latvijaa PSR Zinatnu akadeuija, Kimijas institute.
(Je)wbpils 11-ovince-Dolomite mortAr)

VEYNBERG, A. (Voinbergs., Adolft Parka d.); VAlVAliS, E., red.; PASTARE, D.,
tekILn. red.
(Impoverishaent of the prolcuiriat in I-aurgecaB Latvial Froletariata
grimsana nabadziba burmaziskaja Latvija. Riett, LatviJas Valata iz-
devnieciba, 1959. 192 p. (In Latvianl. NIRA Ll,,: U)
(Latvia,---Labor and laboripg classes)

SMINS A. - rod.; AIZUPIETE, M.p tekhn. red.
y p V~N~ARS ~E.
(A review of the economic development of Soviet Latvia, 1940-
19581 Apcerejums par Padomju Latvijas ekonomisko at-tiatibu, 1940-
195S. Riga, LatviJas Volsts izdevnieciba, 1960. 217 P. [In
LELtVian] (MIRA 14:12)
(Latvia-Economic conditions)

BLAMWIS,, L.; MAZUROVS, V.; NIOIS4MS, A.; OMAFOVS, A.; SMIRNICKIS,J.;
jAIVARS, E., red.; DUNAISKIS, Z., tekhn. red.
(Economics of socialist industry; a popular textbook] Socialis-
tiskas rupniecibas ekonomika,- populars iracibu lidzeklis. Riga)
Latvijas valsts izd-ba 1963. 227 p. (MIRA 16:12)
(Russia-Industries)

VEUBBERGSM A,; VAIVARS, E., red.
[Latvian workers on the road to cc=-=n-4=] lpatvilass
stradnieki eels. uz komunismu. Riga.. Latvijas Valsts izd-
ba,, 1964. 181 p. [In Latvian) (MIRA 17:.U)

VAIVARS, H. (Riga)
Solution on an electrmic analogute Aachine of two differential
equations with conjugating boundary conditiona. Vestis Latv ak n0.2:
5:L-56 160. (EEAI 10:1)
1. Akademiya. nauk Latviyakay SSR9 Institut energetiki i elektro-
tekhniki.
(Electronic analogue computers)
(Boundary value problems)
(Differential equations)

2 233$
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AUTHORSt
TITLEz
PERIODICAL:
Jakubaitis, E.,.Vaivars, M._
S/197/61/000/003/00-1/003
B101/B206
Apparatus for determining the time constlLnt of an electro-
magnetic attenuation process
Izvestiya Akademii nauk Latviyskoy SSR, no. 3, 1961, 41-50
TEXT: Till now, the time constant of a transition process had to be
calculated from the oscillogram, which is rather complicated. This
article describes an apparatus on the basis of computer engineering, which
serves for direct measurement of the time constant. The following
equations are written down for the process: u = U 0exp(-t/T) (1), where
U is the initial value and T the time constant. Since
0
du/dt - -(U0/T)exp(-t/T) (2), T = u/(-du/dt) (3). Fig. 1 shows the
principal circuit of an apparatus performing the mathematical operation
of Eq...W. The voltage u to be investigated is fed to the pre-amplifier%
and after amplification (ku), to the differentiator 2. The output
voltag6'of the differentiator is proportional to du/dt. In the dividing
Card 1 5/'

22338
S/19 61/000/003/001/003
ApparE.tus for determining... B101 YB206
unit 't, ku is divided by du/dt and gives the time constant T. Fig. 2
shows the circuit diagram of the apparatus. The amplifier 1 serves for
the allLpli-fication of the input voltage. The differentiator 2 is an
amplifier with capacitance at the input and active resistance in the
feedbetek. For the stabilization of 2, a small active resistance is
conne(;ted in series to the capacitance; this resistance is not shown
in Fig. 2 and does not cause any noticeable error. The6 fl multiplier
serveo for dividing voltage u1 by voltage u2, which is proportional to the
deriviLtive of ul, and the nonlinear unit 5H with hyperbolic
characteristic for forming the reciprocal value of u2. The amplifiers
3 and 4 belong to the nonlinear unit and multiplier, the amplifiers 5,
6, 7 iierve for changing the voltage sign. 5 0 is the measuring unit.
The maximum voltage admissible for the units used amounts to 100 v.
It is attained at the output of 1. u2 = (Uok2/T)exp(-t/T) (6) is
writtcn down for the voltage at the output of 2. The condition
UO = 11.2 = 100 v is fulfilled at k2 =T (7). u3 = k2/U2 (8) is written
Card 2/8-1/

22336
S/197 61/000/003/001/003
Appa:?atus for determining... Biol/B206
down for the voltage u3 at the output of the nonlinear unit, and
U 4 ~0.01ulu3 (9) for'u4 at the output of the multiplier.
u 4 ~0.01k3T/'k2 (10) results therefrom. If u 4 min - 100a; (0